We have an ANT EEG 128 channel amplifier (asalab) and two Cedrus StimTrackers.

Whenever either one of the StimTrackers (or various StimTracker component combinations) is connected to the amplifier and is drawing power from the power strip that the ANT system is drawing power from, we can no longer record EEG due to high amplitude electrical noise.

The ANT system records normally when the StimTracker is not plugged into the power strip, or any other wall socket.

The one thing we do not have a duplicate of is the "StimTracker for ANT Neuro" male to female adapter boards that plugs into the 'parallel' and 'extra' ports of the StimTracker.

Sorry, we do have a StimTracker for ANT Neuro signal adapter board, which we are using. We just do not have two of them to test whether or not the adapter board was the problem.

After further tests we have discovered that the noise is all 60 Hz and is coming through the parallel cable into the ANT system. Underneath the 60 Hz noise is perfectly fine EEG. The amplifier works fine without the parallel cable attached to the ANT and StimTracker

In summary:
(1) We have tested 2 stim tracker boxes with the same ANT adaptor
(2) We have tried two different parallel cables
(3) The noise is all 60 Hz.